Adds a better git log

So, are you tired of this old and bored git log screen? How about this one,
instead?

And every time you need to see your log, just type in:

`git lg`

Or, if you want to see the lines that changed

`git lg -p`

https://coderwall.com/p/euwpig
Ignores .cache directory
Ignores fish history
Ignores fishd files
Ignores node and npm files